For underground oil tanks, like those in gas stations, the tank chambers are made of reinforced concrete to prevent leakage; but how is water accumulated due to rain drained?

Put a shed on top, and rainwater won’t get in. The jar must be soaked in water; I have epoxy here, which is used for this purpose.

Generally, that’s not done. 1. After the trough is repaired, the horizontal tank is placed in it, the pipes are installed, and it is filled with sand. Burying sand prevents the accumulation of oil and gas, which could lead to detonation! 2. If you really want to create a layout similar to that on the ground, then you need to dig a square pit of 0.5*0.5*0.5 meters or larger in one corner of the trench; the floor of the entire trench should slope at a rate of 0.3% toward this pit. An explosion-proof submersible pump or explosion-proof self-priming pump is installed at the square pit, along with a liquid level automatic control switch. (A filter should be installed at the pump inlet, and the tank should be cleaned regularly.) The latter poses a serious threat: when a walkway is provided, regular inspections and maintenance are necessary; the nails on leather shoes and ladders can easily generate sparks, and oil and gas accumulating in the floor grooves can lead to explosions!

This post was last edited by woshishei007 on 2016-10-20 at 22:48. I have been working in Sinopec gas stations for over a decade, and if everyone followed the methods suggested by those above, all gas stations would go under. Regarding the situation mentioned by the original poster, in 2015 the State Council issued the \"Notice of the State Council on Issuing the Action Plan for Water Pollution Prevention and Control\" (Guo Fa [2015] No. 17), requiring that all underground oil tanks at gas stations be replaced with double-layer tanks by the end of 2017, or that leak-proof chambers be installed; the Sinopec gas stations I have worked at all had such leak-proof chambers. Leakage prevention tanks are generally of reinforced concrete structure. Collars are usually installed on the foundation of the oil tanks at the bottom of these tanks to prevent them from floating upward. The foundation of the oil tanks is typically poured together tightly with the bottom slab of the leakage prevention tank, with the rebar being connected in this process. Oil tank clamps based on standard specifications: for Sinopec-standard oil tanks with a capacity of 30 cubic meters, there are usually 2 clamps, while for those with a capacity of 50 cubic meters, 3 clamps are generally used. Because these clamps can effectively prevent the oil tank from floating after being submerged in water. After the oil tank is installed, sand is filled between the tank and the leak-proof pool in accordance with regulatory requirements to prevent the accumulation of oil and gas. Of course, filling with sand and using clamps also cannot prevent oil tanks from floating; Sinopec has come up with another solution: the tops of buried oil tank ponds are covered with concrete slabs to prevent rainwater from entering. The original poster must be asking what if there’s still water inside? Is rainwater leaking in through the cover? What if there are cracks in the seepage pond? The people at Sinopec aren’t stupid either; according to Sinopec’s standards, observation wells made of 300-millimeter concrete pipes are used to monitor the water level inside the seepage prevention tanks. Once the water level reaches a certain level, submersible pumps are used to pump the water out. This was Sinopec’s solution before 2015 to prevent the oil tanks in the containment pools from floating or developing bubbles; essentially, it involved using containment pools along with concrete covers. I’ve never heard of any water accumulation in the stations I’ve worked on, and when water does accumulate, it’s simply pumped out using a small pump. Since there are no bubble tanks, the corrosion resistance is quite good, and water pollution has never been a problem. After 2015, Sinopec began to use double-layer oil tanks in order to reduce its investments. A double-layer oil tank consists of two layers; you can search for this term on Baidu. The outer layer is definitely made of fiberglass, while the inner layer may be made of fiberglass in some cases and steel in other cases. In any case, it is fiberglass that comes into contact with the outside world; fiberglass doesn’t mind being exposed to water, so there’s no need to construct waterproof tanks. Go straight to the double-layer oil tank; since there’s no need to prevent bubbles in such a tank, or it doesn’t matter if bubbles form, 1) a concrete base slab and 2) clamps were used ； 3. Concrete covers: there are three treatment options; the installation of leak prevention tanks and observation wells has been eliminated. Based on the feedback received, double-layer tanks that have been exposed to water or not have basically no problems.

Generally, the top surface of the tank is poured with concrete and sloped outward, with drainage pipes embedded around the tank walls.

Does a leak-proof tank refer to a reinforced concrete structure surrounding the tank and at its bottom, or is it a separate tank?

How can burying sand prevent the accumulation of oil and gas? I would appreciate your advice. When I think of sand, I imagine **sand being fired like bullets; the explosion becomes even more powerful

Sand is buried in the cable trenches and pipe trenches of the hydrogenation plants in petrochemical enterprises, as well as in the underground tanks at gas stations. 1. Reduce the space where flammable gases can accumulate, 2. It is difficult to establish a mixing limit concentration, 3. Decrease the likelihood of flash explosions, 4. Large earth-based flame arresters.

I’ve learned something new. However, the underground sludge tanks in the hydrogenation unit of our workshop weren’t equipped with sand; I’m not sure whether this was an oversight or because it was assumed that since the tanks hold heavy oil and are sealed containers, the amount of vaporization would be very low. Thank you